Un-Revert and put back: "Merge branch 'SlaveInfo' of git://github.com/jaredgrubb/buildbot""

This reverts commit f518276b3a6e88a6b079a4e2661a152087eedd15.

Conflicts:
	master/buildbot/test/unit/test_buildslave_base.py
SetSlaveInfo: fix bug in implemenation
Add the 'slave info' table to the buildslave web page
Support an empty SVN password
Further change to support empty SVN passwords.
Add unit test for empty SVN password.
add documentation for Force Scheduler's 'buttonName' argument
Merge santegoeds/buildbot:support-empty-svn-password (PR #1117)
Merge jaredgrubb/buildbot:SlaveInfo-UnRevert (PR #1109)

+autopep8
Merge branch 'master' into nine
Merge branch 'master' into nine